messaging

bluetooth mesh chat, IRC vibes

A realtime distributed messaging platform

Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.

High-Performance server for NATS.io, the cloud and edge native messaging system.

IM Chat OpenClaw

Apache Pulsar - distributed pub-sub messaging system

Open source RabbitMQ: core server and tier 1 (built-in) plugins

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots

Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.

Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Distributed Application Framework for .NET

A community-driven replacement for JSQMessagesViewController

Apache Kafka® running on Kubernetes

Kafka implemented in Golang with built-in coordination (No ZK dep, single binary install, Cloud Native)

signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

Orchestrate end-to-end encryption, cryptographic identities, mutual authentication, and authorization policies between distributed applications – at massive scale.

The most widely used PHP client for RabbitMQ

The most beautiful SMS messenger for Android

Apache Iggy: Hyper-Efficient Message Streaming at Laser Speed